<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="Test_1.css">
</head>
<body>
    <div class="background">
        <div clsaa="header">顶部(header)</div>
        <div class="login">登录(login)</div><div class="login_right">登录说明(login_right)</div>
        <div class="footer">底部(footer)</div>
    </div>
</body>
</html>